Introduce unregisterProtocolHandler() and isProtocolHandlerRegistered() webview API

public/web/WebViewClient.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 #define WebViewClient_h
 
 #include "../platform/WebColor.h"
 #include "../platform/WebGraphicsContext3D.h"
 #include "../platform/WebString.h"
 #include "WebAXEnums.h"
 #include "WebContentDetectionResult.h"
 #include "WebDragOperation.h"
 #include "WebFileChooserCompletion.h"
 #include "WebFileChooserParams.h"
+#include "WebNavigatorContentUtilsClient.h"
 #include "WebPageVisibilityState.h"
 #include "WebPopupType.h"
 #include "WebTextAffinity.h"
 #include "WebTextDirection.h"
 #include "WebWidgetClient.h"
 
 namespace blink {
 
 class WebAXObject;
 class WebColorChooser;
@@ skipping 298 matching lines @@
     // Informs the browser that the zoom level has changed as a result of an
     // action that wasn't initiated by the client.
     virtual void zoomLevelChanged() { }
 
     // Registers a new URL handler for the given protocol.
     virtual void registerProtocolHandler(const WebString& scheme,
                                          const WebString& baseUrl,
                                          const WebString& url,
                                          const WebString& title) { }
 
+    // Unregisters a given URL handler for the given protocol.
+    virtual void unregisterProtocolHandler(const WebString& scheme, const WebString& baseUrl, const WebString& url) { }
+
+    // Check if a given URL handler is registered for the given protocol.
+    virtual WebCustomHandlersState isProtocolHandlerRegistered(const WebString& scheme, const WebString& baseUrl, const WebString& url)
+    {
+        return WebCustomHandlersNew;
+    }
+
     // Visibility -----------------------------------------------------------
 
     // Returns the current visibility of the WebView.
     virtual WebPageVisibilityState visibilityState() const
     {
         return WebPageVisibilityStateVisible;
     }
 
     // Media Streams -------------------------------------------------------
 
@@ skipping 22 matching lines @@
     // Informs the browser that the draggable regions have been updated.
     virtual void draggableRegionsChanged() { }
 
 protected:
     ~WebViewClient() { }
 };
 
 } // namespace blink
 
 #endif